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7.2.8. The sensor of temperature of the soaked-up air (IAT sensor)


The IAT sensor represents the thermoresistor which resistance increases at fall of temperature.

Check
PERFORMANCE ORDER
1. On 4-cylinder engines disconnect the socket which is in the air filter from the sensor, check sensor resistance at various temperatures (See the table of Value of resistance of serviceable sensors of temperature of the soaked-up air and cooling liquid at various temperatures on 4-cylinder engines), blowing in the sensor, for example, the hair dryer. If resistance of the sensor changes with a temperature disproportionately, then it should be replaced.
2. On 6-cylinder engines disconnect the socket from the sensor, check sensor resistance at various temperatures, having attached an ohmmeter to conclusions of the 4 and 5 sensor, and compare with tabular (see the table of Value of resistance of serviceable sensors of temperature of the soaked-up air and cooling liquid at various temperatures on 6-cylinder engines). If resistance of the sensor does not correspond tabular, then it should be replaced.

Values of resistance of serviceable sensors of temperature of the soaked-up air and cooling liquid at various temperatures on 4-cylinder engines

Temperature, °C
Resistance, Ohm
100
125
90
250
80
300
70
400
60
500
50
625
45
750
40
875
35
1000
30
1500
25
2000
20
2500
15
3000
10
3500
4,5
4000
0
4500

Values of resistance of serviceable sensors of temperature of the soaked-up air and cooling liquid at various temperatures on 6-cylinder engines

Contact
Soprtivleniye, Ohm
Temperature, °C
5 – 4
13,6 – 18,4
– 20
5 – 4
2,21 – 2,69
20
5 – 4
0,49 – 0,67
60

Replacement (4-cylinder engines)
Prevention

On 6-cylinder engines the IAT sensor is executed in the uniform module with the air consumption sensor.

PERFORMANCE ORDER
1. Switch off ignition.
2. Disconnect the socket and remove the sensor.